allen



(No Model.)

0. H. GROOKETT & G. G. ALLEN.

ELECTRIC ANNUNOIATOR.

No. 388,837. Patented Sept. 4, 1888.

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UNITED STATES CHARLES H. CROCKETT AND CHANCELLOR C. ALLEN, OF BOSTON,

C HUSETTS.

PATENT OFFICE.

MA SSA ELECTRIC ANNUNCIATOR.

SPECIFICATION forming part of Letters Patent No. 388,837, dated September 4, 1888.

Application filed September 6, 18?.

To all whom it may concern.-

Be it known that we, CHAnLEs H. ORooK- ETT and OHANOELLOR C. ALLEN, citizens of the United States, and residents of Boston, Suffolk county, Massachusetts, have invented certain new and useful Improvements in Electric Annunciators, of which the following is a specification.

Our invention relates to electric an nunciators, and has for its object to provide a simple, cheap, and effective anmmciator that shall occupy but small space and be positive and sure in its operations.

To these ends the annunciator consists of a main plate or frame of any suitable material, such as brass, having the upper end bent at right angles and the body extending downward, and preferably having a bend or offset, so that the lower part extends in a plane parallel to the upper part. The lowerportion of the body is expanded, and is provided with lugs or cars bent forward to support the drop. The drop consists of a plate having triangularshaped ends bent at right angles to the body of the plate, which ends are pivoted to the lugs on the lower portion of the main frame. To the upper bent end of the main frame is secured a bent permanent magnet, and to the downwardly-projecting end of the magnet and the frame is secured a helix upon a soft-iron core extending from the upper bent end of the magnet. An armature is pivoted in the forked lower end of the permanent magnet and extends backward under the helix toward the main frame. The drop-plate is provided with a finger which engages the inner end of the armature when the magnet is not energized and holds the drop up, and the end of the armature is provided with an attached plate or finger bent downward and for ward, and this plate rests directly upon the end of the finger of the drop. \Vhen the magnet is energized and the armature consequently lifted, the drop falls by gravity, and it is stopped and sustained in position by a finger projecting from the body-plate below the lugs. It often happens that the armature of an annunciator sticks to the core of the magnet on account of the residual magnetism or otherwise, and when the drop is raised the Serial No. 248,932. (No model.)

armature does not operate to hold it in position. To prevent such accidents the finger on the drop is made to impinge upon the curved plate or arm on the end of the armatnre, which is so formed that the armature will be forcibly drawn away from the core when the drop is lifted by hand or otherwise and is caused to fall and lock the drop in po sition. The indicatingmarks upon the drop may be placed directly upon the face thereof, or a movable card or plate may be secured thereto by suitable lips or lugs.

Referring now to the accompanying drawings, forming part of this specification, Fig ure 1 is a side view of our annunciator with the drop down. Fig. 2 is a similar view with the drop nearly up and showing how the armature is pulled from the core when it sticks thereto by the finger or the drop, and Fig. 3 is a front view showing one form ofarranging a series of annunciators and cores therefor.

A is the main frame, having the bent end A, to which the permanent magnet 11 is so cured, the soft-iron core 0 of the magnet being secured to one end of the magnet and the coil D embracing the core. The armature E, pivoted in the forked end B of the magnet, is tapered at the end E and forms a stop for the pin F of the drop F, which is pivoted in the lugs A and supported when down by the finger A. The lug F impinges against the finger e on the end of the armature and forces the armature away from the core if it be held there from any cause. The lipsf will hold a card or indicator on the face of the drop.

In Fig. 3, l 2 3 4 are the annunciator-drops, secured upon a suitable base-piece, M, upon which the bell or signal N is secured, and 0 is the slide for raising the drops to their normal conditions. The circuits through the bell and annunciators are plainly indicated, and need not be specifically described.

It is evident that the details of construction and arrangement of parts may be varied with out departing from our invention, and we do not limit our invention to what is shown and described.

What we claim is 1. The combination, in an annunciator, of a main frame having the bent end A; the bent magnet B, secured to such bent end and em tending downward substantially parallel with the frame, a soft-iron core, 0, surrounded by a coil secured to the magnet B and lying be 5 tween it and the frame, and an armature piv oted to themagnetB,substantiallyasdescribed.

2. The combination, with the main frame,

of a drop consisting of a plate having triangularshaped ends pivoted to lugs on the main no frame and on the face of which the signal is displayed, an armature for supporting the drop in its elevated position, and a finger, A,

projecting from the frame and arranged to arrest and support the drop with its face era 15 posed. substantially as described.

3. The combination, with the frame, magnet, and armature, of the drop, the curved linger c on the end of the armature, and the pi 11 F carried by the drop,by which it is held up and arranged to impinge upon the curved 2o finger of the armature when the drop is raised,

in order to positively withdraw the armature from contact with the magnet, substantially as described.

In testimony whereof we have signed our 25 names to this specification in the presence of two subscribing witnesses.

CHARLES II. (JROGKETT. CIIANCIGLLOR O. A LLEN. Witnesses:

SIMON W. IIATnIcwAY,

lnARLEs E. Lowi). 

